0D-1D-2D multidimensionally assembled Co₉S₈/CNTs/MoS₂ composites for ultralight and broadband electromagnetic wave absorption

Rational design of hierarchical structure is essential for preparing high-performance electromagnetic wave (EMW) absorbing materials. Herein, 0D-1D-2D hybridized Co₉S₈/CNTs/MoS₂ composite is prepared by assembling MoS₂ nanosheets and Co₉S₈ particles on metal organic framework compound-derived CNT microcages. This multidimensionally hybridized structure can not only avoid the restacking of MoS₂ nanosheets and the agglomeration of Co₉S₈ particles, but also maximize the synergistic effect of three components. CNT porous microcages with proper conductivity increase conduction loss and promote impedance matching. MoS₂ nanosheets assemble into wrinkled surfaces, providing intrinsic polarization loss and increasing EMW scattering area. Randomly distributed Co₉S₈ particles work as dielectric additives to enhance interfacial polarization effect. Co₉S₈/CNTs/MoS₂ composite exhibits significantly improved EMW absorbing properties in reducing filler loading and broadening absorption bandwidth. At an ultralow filler loading of 9 wt%, the minimum RL value achieves −35.4 dB, and the effective absorption bandwidth boosts to 8.4 GHz. By simulating the electric field distribution and radar scatter section, we further reveal the significant suppression effect of Co₉S₈/CNTs/MoS₂ on electromagnetic scattering radiation.